Staff profile

Journal Article

• The emperor’s new arc: gigaparsec patterns abound in a ΛCDM universe
  
  Sawala, T., Teeriaho, M., Frenk, C. S., Helly, J., Jenkins, A., Racz, G., Schaller, M., & Schaye, J. (2025). The emperor’s new arc: gigaparsec patterns abound in a ΛCDM universe. Monthly Notices of the Royal Astronomical Society: Letters, 541(1), L22-L27. https://doi.org/10.1093/mnrasl/slaf021
• FLAMINGO: combining kinetic SZ effect and galaxy–galaxy lensing measurements to gauge the impact of feedback on large-scale structure
  
  McCarthy, I. G., Amon, A., Schaye, J., Schaan, E., Angulo, R. E., Salcido, J., Schaller, M., Bigwood, L., Elbers, W., Kugel, R., Helly, J. C., Forouhar Moreno, V. J., Frenk, C. S., McGibbon, R. J., Ondaro-Mallea, L., & van Daalen, M. P. (2025). FLAMINGO: combining kinetic SZ effect and galaxy–galaxy lensing measurements to gauge the impact of feedback on large-scale structure. Monthly Notices of the Royal Astronomical Society, 540(1), 143-163. https://doi.org/10.1093/mnras/staf731
• The unabridged satellite luminosity function of Milky Way-like galaxies in ΛCDM: the contribution of ‘orphan’ satellites
  
  Santos-Santos, I. M. E., Frenk, C. S., Navarro, J. F., Cole, S., & Helly, J. (2025). The unabridged satellite luminosity function of Milky Way-like galaxies in ΛCDM: the contribution of ‘orphan’ satellites. Monthly Notices of the Royal Astronomical Society, 540(1), 1107-1123. https://doi.org/10.1093/mnras/staf749
• On the accuracy of dark matter halo merger trees and the consequences for semi-analytic models of galaxy formation
  
  Chandro-Gómez, Ángel, Lagos, C. del P., Power, C., Moreno, V. J. F., Helly, J. C., Lacey, C. G., McGibbon, R. J., Schaller, M., & Schaye, J. (2025). On the accuracy of dark matter halo merger trees and the consequences for semi-analytic models of galaxy formation. Monthly Notices of the Royal Astronomical Society, 539(2), 776-807. https://doi.org/10.1093/mnras/staf519
• The FLAMINGO project: the coupling between baryonic feedback and cosmology in light of the S8 tension
  
  Elbers, W., Frenk, C. S., Jenkins, A., Li, B., Helly, J. C., Kugel, R., Schaller, M., Schaye, J., Braspenning, J., Kwan, J., McCarthy, I. G., Salcido, J., van Daalen, M. P., Vandenbroucke, B., & Pascoli, S. (2025). The FLAMINGO project: the coupling between baryonic feedback and cosmology in light of the S8 tension. Monthly Notices of the Royal Astronomical Society, 537(2), 2160-2178. https://doi.org/10.1093/mnras/staf093
• The FLAMINGO project: a comparison of galaxy cluster samples selected on mass, X-ray luminosity, Compton-Y parameter, or galaxy richness
  
  Kugel, R., Schaye, J., Schaller, M., McCarthy, I. G., Braspenning, J., Helly, J. C., Forouhar Moreno, V. J., & McGibbon, R. J. (2024). The FLAMINGO project: a comparison of galaxy cluster samples selected on mass, X-ray luminosity, Compton-Y parameter, or galaxy richness. Monthly Notices of the Royal Astronomical Society, 534(3), 2378-2396. https://doi.org/10.1093/mnras/stae2218
• A unified model for the clustering of quasars and galaxies at z ≈ 6
  
  Pizzati, E., Hennawi, J. F., Schaye, J., Schaller, M., Eilers, A.-C., Wang, F., Frenk, C. S., Elbers, W., Helly, J. C., Mackenzie, R., Matthee, J., Bordoloi, R., Kashino, D., Naidu, R. P., & Yue, M. (2024). A unified model for the clustering of quasars and galaxies at z ≈ 6. Monthly Notices of the Royal Astronomical Society, 534(4), 3155-3175. https://doi.org/10.1093/mnras/stae2307
• EIGER. VI. The Correlation Function, Host Halo Mass, and Duty Cycle of Luminous Quasars at z ≳ 6
  
  Eilers, A.-C., Mackenzie, R., Pizzati, E., Matthee, J., Hennawi, J. F., Zhang, H., Bordoloi, R., Kashino, D., Lilly, S. J., Naidu, R. P., Simcoe, R. A., Yue, M., Frenk, C. S., Helly, J. C., Schaller, M., & Schaye, J. (2024). EIGER. VI. The Correlation Function, Host Halo Mass, and Duty Cycle of Luminous Quasars at z ≳ 6. The Astrophysical Journal, 974(2), Article 275. https://doi.org/10.3847/1538-4357/ad778b
• Relativistic SZ temperatures and hydrostatic mass bias for massive clusters in the FLAMINGO simulations
  
  Kay, S. T., Braspenning, J., Chluba, J., Helly, J. C., Kugel, R., Schaller, M., & Schaye, J. (2024). Relativistic SZ temperatures and hydrostatic mass bias for massive clusters in the FLAMINGO simulations. Monthly Notices of the Royal Astronomical Society, 534(1), 251-270. https://doi.org/10.1093/mnras/stae1991
• The FLAMINGO project: galaxy clusters in comparison to X-ray observations
  
  Braspenning, J., Schaye, J., Schaller, M., McCarthy, I. G., Kay, S. T., Helly, J. C., Kugel, R., Elbers, W., Frenk, C. S., Kwan, J., Salcido, J., van Daalen, M. P., & Vandenbroucke, B. (2024). The FLAMINGO project: galaxy clusters in comparison to X-ray observations. Monthly Notices of the Royal Astronomical Society, 533(3), 2656-2676. https://doi.org/10.1093/mnras/stae1436
• Swift: A modern highly-parallel gravity and smoothed particle hydrodynamics solver for astrophysical and cosmological applications
  
  Schaller, M., Borrow, J., Draper, P. W., Ivkovic, M., McAlpine, S., Vandenbroucke, B., Bahé, Y., Chaikin, E., Chalk, A. B. G., Chan, T. K., Correa, C., van Daalen, M., Elbers, W., Gonnet, P., Hausammann, L., Helly, J., Huško, F., Kegerreis, J. A., Nobels, F. S. J., … Xiang, Z. (2024). Swift: A modern highly-parallel gravity and smoothed particle hydrodynamics solver for astrophysical and cosmological applications. Monthly Notices of the Royal Astronomical Society, 530(2), 2378–2419. https://doi.org/10.1093/mnras/stae922
• Non-linear CMB lensing with neutrinos and baryons: FLAMINGO simulations versus fast approximations
  
  Upadhye, A., Kwan, J., McCarthy, I. G., Salcido, J., Helly, J. C., Kugel, R., Schaller, M., Schaye, J., Braspenning, J., Elbers, W., Frenk, C. S., van Daalen, M. P., Vandenbroucke, B., & Broxterman, J. C. (2024). Non-linear CMB lensing with neutrinos and baryons: FLAMINGO simulations versus fast approximations. Monthly Notices of the Royal Astronomical Society, 529(2), 1862-1876. https://doi.org/10.1093/mnras/stae663
• The FLAMINGO project: baryonic impact on weak gravitational lensing convergence peak counts
  
  Broxterman, J. C., Schaller, M., Schaye, J., Hoekstra, H., Kuijken, K., Helly, J. C., Kugel, R., Braspenning, J., Elbers, W., Frenk, C. S., Kwan, J., McCarthy, I. G., Salcido, J., van Daalen, M. P., & Vandenbroucke, B. (2024). The FLAMINGO project: baryonic impact on weak gravitational lensing convergence peak counts. Monthly Notices of the Royal Astronomical Society, 529(3), 2309-2326. https://doi.org/10.1093/mnras/stae698
• The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys
  
  Schaye, J., Kugel, R., Schaller, M., Helly, J. C., Braspenning, J., Elbers, W., McCarthy, I. G., van Daalen, M. P., Vandenbroucke, B., Frenk, C. S., Kwan, J., Salcido, J., Bahe´, Y. M., Borrow, J., Chaikin, E., Hahn, O., Husko, F., Jenkins, A., Lacey, C. G., & Nobels, F. S. J. (2023). The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys. Monthly Notices of the Royal Astronomical Society, 526(4), 4978–5020. https://doi.org/10.1093/mnras/stad2419
• The FLAMINGO project: revisiting the S8 tension and the role of baryonic physics
  
  Elbers, W., Helly, J., Frenk, C., McCarthy, I. G., Salcido, J., Schaye, J., Kwan, J., Schaller, M., Braspenning, J., van Daalen, M. P., Vandenbroucke, B., Conley, J. T., Font, A. S., & Upadhye, A. (2023). The FLAMINGO project: revisiting the S8 tension and the role of baryonic physics. Monthly Notices of the Royal Astronomical Society, 526(4), 5494–5519. https://doi.org/10.1093/mnras/stad3107
• Is the Core-cusp Problem a Matter of Perspective? Jeans Anisotropic Modeling against Numerical Simulations
  
  Wang, W., Zhu, L., Li, Z., Chen, Y., Han, J., He, F., Yang, X., Jing, Y., Frenk, C., Nie, J., Tian, H., Liu, C., Cao, Y., Qiu, X., Helly, J., Grand, R. J. J., & Gomez, F. A. (2022). Is the Core-cusp Problem a Matter of Perspective? Jeans Anisotropic Modeling against Numerical Simulations. The Astrophysical Journal, 941(2), Article 108. https://doi.org/10.3847/1538-4357/ac9b19
• SIBELIUS-DARK: a galaxy catalogue of the local volume from a constrained realization simulation
  
  McAlpine, S., Helly, J. C., Schaller, M., Sawala, T., Lavaux, G., Jasche, J., Frenk, C. S., Jenkins, A., Lucey, J. R., & Johansson, P. H. (2022). SIBELIUS-DARK: a galaxy catalogue of the local volume from a constrained realization simulation. Monthly Notices of the Royal Astronomical Society, 512(4), 5823-5847. https://doi.org/10.1093/mnras/stac295
• Halo merger tree comparison: impact on galaxy formation models
  
  Gómez, J. S., Padilla, N., Helly, J., Lacey, C., Baugh, C., & Lagos, C. (2022). Halo merger tree comparison: impact on galaxy formation models. Monthly Notices of the Royal Astronomical Society, 510(4), 5500-5519. https://doi.org/10.1093/mnras/stab3661
• The DESI N-body simulation project – I. Testing the robustness of simulations for the DESI dark time survey
  
  Grove, C., Chuang, C.-H., Devi, N. C., Garrison, L., L’Huillier, B., Feng, Y., Helly, J., Hernández-Aguayo, C., Alam, S., Zhang, H., Yu, Y., Cole, S., Eisenstein, D., Norberg, P., Wechsler, R., Brooks, D., Dawson, K., Landriau, M., Meisner, A., … Valenzuela, O. (2022). The DESI N-body simulation project – I. Testing the robustness of simulations for the DESI dark time survey. Monthly Notices of the Royal Astronomical Society, 515(2). https://doi.org/10.1093/mnras/stac1947
• Observing the Stellar Halo of Andromeda in Cosmological Simulations: The AURIGA2PANDAS Pipeline
  
  Thomas, G. F., Martin, N. F., Fattahi, A., Ibata, R. A., Helly, J., McConnachie, A. W., Frenk, C., Gómez, F. A., Grand, R. J., Gwyn, S., Mackey, D., Marinacci, F., & Pakmor, R. (2021). Observing the Stellar Halo of Andromeda in Cosmological Simulations: The AURIGA2PANDAS Pipeline. Astrophysical Journal, 910(2), Article 92. https://doi.org/10.3847/1538-4357/abdfd2
• Constraints on the properties of warm dark matter using the satellite galaxies of the Milky Way
  
  Newton, O., Leo, M., Cautun, M., Jenkins, A., Frenk, C. S., Lovell, M. R., Helly, J. C., Benson, A. J., & Cole, S. (2021). Constraints on the properties of warm dark matter using the satellite galaxies of the Milky Way. Journal of Cosmology and Astroparticle Physics, 2021(08), Article 062. https://doi.org/10.1088/1475-7516/2021/08/062
• Do model emission line galaxies live in filaments at z∼1?
  
  Gonzalez-Perez, V., Cui, W., Contreras, S., Baugh, C., Comparat, J., Griffin, A., Helly, J., Knebe, A., Lacey, C., & Norberg, P. (2020). Do model emission line galaxies live in filaments at z∼1?. Monthly Notices of the Royal Astronomical Society, 498(2), 1852-1870. https://doi.org/10.1093/mnras/staa2504
• The total satellite population of the Milky Way
  
  Newton, O., Cautun, M., Jenkins, A., Frenk, C. S., & Helly, J. C. (2018). The total satellite population of the Milky Way. Monthly Notices of the Royal Astronomical Society, 479(3), 2853-2870. https://doi.org/10.1093/mnras/sty1085
• Comparing galaxy formation in semi-analytic models and hydrodynamical simulations
  
  Mitchell, P. D., Lacey, C. G., Lagos, C. D., Frenk, C. S., Bower, R. G., Cole, S., Helly, J. C., Schaller, M., Gonzalez-Perez, V., & Theuns, T. (2018). Comparing galaxy formation in semi-analytic models and hydrodynamical simulations. Monthly Notices of the Royal Astronomical Society, 474(1), 492-521. https://doi.org/10.1093/mnras/stx2770
• Baryon effects on void statistics in the EAGLE simulation
  
  Paillas, E., Lagos, C. D., Padilla, N., Tissera, P., Helly, J., & Schaller, M. (2017). Baryon effects on void statistics in the EAGLE simulation. Monthly Notices of the Royal Astronomical Society, 470(4), 4434-4452. https://doi.org/10.1093/mnras/stx1514
• A chronicle of galaxy mass assembly in the EAGLE simulation
  
  Qu, Y., Helly, J., Bower, R., Theuns, T., Crain, R., Frenk, C., Furlong, M., McAlpine, S., Schaller, M., Schaye, J., & White, S. (2017). A chronicle of galaxy mass assembly in the EAGLE simulation. Monthly Notices of the Royal Astronomical Society, 464(2), 1659-1675. https://doi.org/10.1093/mnras/stw2437
• A unified multiwavelength model of galaxy formation
  
  Lacey, C. G., Baugh, C. M., Frenk, C. S., Benson, A. J., Bower, R. G., Cole, S., Gonzalez-Perez, V., Helly, J. C., Lagos, C. D., & Mitchell, P. D. (2016). A unified multiwavelength model of galaxy formation. Monthly Notices of the Royal Astronomical Society, 462(4), 3854-3911. https://doi.org/10.1093/mnras/stw1888
• Galaxies in the EAGLE hydrodynamical simulation and in the Durham and Munich semi-analytical models
  
  Guo, Q., Gonzalez-Perez, V., Guo, Q., Schaller, M., Furlong, M., Bower, R., Cole, S., Crain, R., Frenk, C., Helly, J., Lacey, C., Lagos, C. d. P., Mitchell, P., Schaye, J., & Theuns, T. (2016). Galaxies in the EAGLE hydrodynamical simulation and in the Durham and Munich semi-analytical models. Monthly Notices of the Royal Astronomical Society, 461(4), 3457-3482. https://doi.org/10.1093/mnras/stw1525
• The Copernicus Complexio: a high-resolution view of the small-scale Universe
  
  Hellwing, W., Frenk, C., Cautun, M., Bose, S., Helly, J., Jenkins, A., Sawala, T., & Cytowski, M. (2016). The Copernicus Complexio: a high-resolution view of the small-scale Universe. Monthly Notices of the Royal Astronomical Society, 457(4), 3492-3509. https://doi.org/10.1093/mnras/stw214
• A new methodology to test galaxy formation models using the dependence of clustering on stellar mass
  
  Campbell, D., Baugh, C., Mitchell, P., Helly, J., Gonzalez-Perez, V., Lacey, C., Lagos, C. d. P., Simha, V., & Farrow, D. (2015). A new methodology to test galaxy formation models using the dependence of clustering on stellar mass. Monthly Notices of the Royal Astronomical Society, 452(1), 852-871. https://doi.org/10.1093/mnras/stv1315
• N-body dark matter haloes with simple hierarchical histories
  
  Jiang, L., Helly, J., Cole, S., & Frenk, C. (2014). N-body dark matter haloes with simple hierarchical histories. Monthly Notices of the Royal Astronomical Society, 440(3), 2115-2135. https://doi.org/10.1093/mnras/stu390
• Simulations of the formation, evolution and clustering of galaxies and quasars
  
  Springel, V., White, S., Jenkins, A., Frenk, C., Yoshida, N., Gao, L., Navarro, J., Thacker, R., Croton, D., Helly, J., Peacock, J., Cole, S., Thomas, P., Couchman, H., Evrard, A., Colberg, J., & Pearce, F. (2005). Simulations of the formation, evolution and clustering of galaxies and quasars. Nature, 435(7042), 629-636. https://doi.org/10.1038/nature03597
• Galaxy formation using halo merger histories taken from N-body simulations
  
  Helly, J., Cole, S., Frenk, C., Baugh, C., Benson, A., & Lacey, C. (2003). Galaxy formation using halo merger histories taken from N-body simulations. Monthly Notices of the Royal Astronomical Society, 338(4), 903-912. https://doi.org/10.1046/j.1365-8711.2003.06151.x
• A comparison of gas dynamics in smooth particle hydrodynamics and semi-analytic models of galaxy formation
  
  Helly, J., Cole, S., Frenk, C., Baugh, C., Benson, A., Lacey, C., & Pearce, F. (2003). A comparison of gas dynamics in smooth particle hydrodynamics and semi-analytic models of galaxy formation. Monthly Notices of the Royal Astronomical Society, 338(4), 913-925. https://doi.org/10.1046/j.1365-8711.2003.06152.x